Abrading-disk



Patented ont. 24,1882;

Mzaim/ N. PErEHs. POwm-L'nhognphen wanm'ngim D. CA

Y @site States Aram @ri-ica EDIVARD B. CALL, OF TEORIA, ILLINOIS.

ABRADING-DISK.

SPECIFICATION forming part of Letters Patent No. 266,346, dated October24, 1882.

Application tiled May 17, i882. (No model.)

To all whom it may concern:

Be it known that I, EDWARD B. CALL, of Peoria, in the county of Peoriaand State of Illinois,h are in rented an Improved Abra-ding- Disk; and Ido hereby declare that the following isafull, clear, and exactdescription thereof, reference being had to the annexed drawing, makinga part of this specification, in which like letters of reference referto like parts, and in which the ligure represents a cross-sectionthrough the center of the disk.

Myinventiou is in that line ofgrindiug-disks for dental purposes inwhich the abrading is to be done upon the contiguous sides of teeth.This obliges the disk to be of course very thin, making a solid wheelcompounded of shellac and corundum iiiipracticable. As corundum asordinarily applied cannot be made to adhere well to a thin metal disk, Ihave devised the following process and construction for a thinabrading-disk.

I take a thin steel disk and oxidize somewhat deeply one side. Thisprocess of oxidation is substantially as follows: IIavingcoated onesurface of my steel disk with varnish or Wax, I put said disk intoacid-nitro-muriatie acid preferred-and retain it therein until itsuncovered side has been sufficiently eaten in to produce the desireddegree of roughness. Salt and water I also use for this same purpose ofoxidation; but it is not as as rapid in its Work astheaquaregiajustdescribed. When manufacturing these disks in quantities Icorrode in a similar way one surface of a large sheet of steel and stampsubsequently therefrom the disks. As I desire a disk that shall grindwith one surface only, that there may be no danger of abrading the Wrongtooth, I polish the uiioxidized surface of the disk. The purpose ofoxidizing the face of the steel is to make a thoroughly rough surface,to .which sliellac or other cements can firmly adhere. Other metals canalso be used for the disks; but I prefer steel, on account of being thusable to produce a corrugated surface so easily and thoroughly by meansof oxidation. No mechanical means can equal this chemical way forroughening the face of the disk.

To produce au abrading coating for my thin metal disk, I mix soft rubberand corundum,

shape it into a thin disk of the same diameter asmy metal one, and bythe Well-known process of vulcanizing transform the soft rubber of thesame into hard rubber. Vhen shaping this mixed disk I spread it, whensoft, upon a strip of tine silk or other similar fabric. The hardrubberand corundum disk is left, when said silk is removed, with its surfacefinely corrugated.

In manufacturing my abradi iig-disks in quantities I make broad thinsheets of rubber andv corundum hardened and corrugated in a similar Way,and stamp the disks therefrom afterward. Said corrugated surface of therubber disk and the oxidized surface of the'steel disk I coat thinlywith a solution of shellac and alcohol mixed to the consistency ofsirup, place said surfaces together, and put the united disks in a viseheated to about 3100. After a sufficient degree of pressure has beenapplied to said disks through the said heated vise the tivo united diskscoalcsce as one without the possibility of disruption, except upon theapplifrom. Inow therefore haveas theresultofthis .7 process andconstruction a thin disk, one side of which is of smooth metal andtheother a compact abrading-surface.

To make an abrading-disk for Work where more rapidity of grinding isdesired, I omit the rubber and make the coating-mixture for the metaldisk of shellac and corundum. The process of roughcning the surfaces andcementing them togetheris otherwise, however, similar to that justdescribed.

Diamond-dustandotherabradingsubstances can be used in the place ofcorundum, but the latter I find generally preferable.

What Iclaim as my invention,and for which I desire Letters Patent, is asfollows, to wit:

l. The hereindescribed process of forming abraidng-disks for dentalpurposes, consisting of producing a corrugated surface upon a vulcanizeddisk hof rubber and some hard powder IOO and cementing said surface tothe roughened surface ot' a metal disk, substantially as set forth.

2. The hereindescribed process of forming abrading-disks, consisting oi'producing a corrugated surface upon a vulcanized disk of rubber andcorundum, oxidizing the surface of a steel disk, and cemcnting the tworoughened surfaces together.

3. As an article of manufacture, a grindingplate consisting of a thinlayer ot' hard rubber mixed with some abrading-powder, cemented to theoxidized surface of a steel plate,

substantially as and for the purpose spccitied. i

4L. A grindingdisk consisting of a thin disk of hard rubber mixed withcorundnm and ccmen ted to the oixdized surface of a steel disk.

5. An abrading-disk consisting of a. thin disk of some easilyfusiblesubstance mixed with a gritty powder and cemented to the oxid` izedsurface of a steel disk.

In testimony that I claim the foregoing invention I have hereunto set myhand this 5th day of May, 1882.

ED\VARD B. CALL.

'Vitnesses:

H. W. WELLS,

trom). A. GoLDsBuoUGH.

